Field notes
Plan from facts,
not camera folklore.
Short, practical explanations for the assumptions that change a recorder, switch, or lens decision.
How much storage do security cameras need?
A bitrate-first method for sizing retention without pretending resolution alone determines storage.
Security camera bitrate: what to use in a storage plan
Where bitrate comes from, why it moves, and how to build low/base/high scenarios.
H.264 vs H.265 storage: plan the saving, do not assume it
Why codec efficiency is scene-dependent and how to verify the result before buying drives.
How to budget PoE power for security cameras
Use maximum device draw, respect the per-port limit, and keep total switch headroom visible.
CCTV pixel density and DORI, explained carefully
Turn scene width into pixels per metre and understand what the number cannot guarantee.